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Vq25 Dump Pipe

sky^rkt

By sky^rkt,
in Four Door Family & Wagoneers

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Daleo Grand Master

Daleo

Posted
Posted (edited)

How is that a design fault when you guys say it's from lack of servicing!!!

It's no different to the oil squirtters for the cams in my SR and the built in tiny oil restrictor in my BB Garrett turbo on it. Service the car correctly and they don't block up, don't service the car and they might. Or I suppose that's a design fault too!

For a problem that appears as widespread as this; yes, I believe it is. The guys are only postulating that poor servicing causes it, which is quite possible. Are we now saying virtually all Japanese owners don't service their cars?

My question is; why would you use a 1mm aperture, when a 2mm aperture works fine and wouldn't block up?

Why is the turbo on our car a 100 000km service item: when on most cars, they can last the life of the vehicle?

If you don't think there's something amiss there; that's fine, but coming from an engineering background, I know that some manufacturers DESIGN some components to fail deliberately; and what better than a 10 cent part that then takes out a $3000 part (oem price) and costs $5000 in labour to repair. On a car that is now worth how much? So 8 grand in parts and labour; because you won't drill a 1mm larger hole in a banjo...

On top of that; surprise surprise; none of this covered by the cars warranty...

Edited by Daleo
slippylotion Mentor

slippylotion

Posted
Posted (edited)

How many cars do you know that are released with a turbo tuned to 13ps?

IMO Nissan accepted potential failure of turbo as an acceptable risk to produce a true sports wagon (Grand tourer)

And don't forget the ceramic turbine wheel.

Edited by slippylotion
Daleo Grand Master

Daleo

Posted
Posted (edited)

How many cars do you know that are released with a turbo tuned to 13ps?

IMO Nissan accepted potential failure of turbo as an acceptable risk to produce a true sports wagon (Grand tourer)

The thing is; the particular reason it appears to be failing is because of inadequate oil supply through an unnecessarily small oil feed orifice.

Scotty ran a used, stock turbo at 19 PSI for months with no issues; doesn't seem to be the turbo itself that is the issue. Seems to be it's support system that causes the problem.

I'm not saying that you shouldn't have to change the oil, and that the car should run forever; just that one hole could be a tiny bit larger, with no detriment to anything else and it mightn't fail at all.

I don't believe that Nissan accepted any kind of failure as an acceptable risk; if they had, the turbo would be a no cost, warranty replacement item, or you'd introduce an updated, or improved part.

If you're happy for the customer to replace an expensive component using their own money, after only 100,000km; you haven't taken any risk at all.

This particular argument doesn't involve boost pressures, ceramic turbines, SR20det piston cooling jets or any other distraction; it's about a 1 mm hole in a banjo bolt.

And it is stupidly, unnecessarily small.whistling.gif

Edited by Daleo
scotty nm35 Grand Master

scotty nm35

Posted
Posted

I agree Dale but many oem turbo's have this issue. The amount of XR6 GT35's I have heard of that have failed due to the oil feed filter blocking up, as long as its cleaned occasionally there is no issue. The problem with ours is it only takes a little gunge to block it.

Daleo Grand Master

Daleo

Posted
Posted (edited)

I hate it how you always sit on the fence Dale. Why don't you get an opinion for once?

LOL. :)

Yeah I know; I'm a bit like Switzerland...whistling.gif

I agree Dale but many oem turbo's have this issue. The amount of XR6 GT35's I have heard of that have failed due to the oil feed filter blocking up, as long as its cleaned occasionally there is no issue. The problem with ours is it only takes a little gunge to block it.

This is sort of my point Scotty; if it was a little bigger from the factory, it might not be an issue at all.

The only down side to having a larger hole in the banjo; is more oil in the turbo core, and that could be cured with a larger diameter oil drain line to allow the aerated oil to escape.

Which is something that could be incorporated at the design stage. Which brings us back to my original point.

I was going to bring up the XR6 turbo feed filter; and removed it so as not to dilute the argument.

Filters should be changed, and normally have a service schedule, so the Falcon one is more a case of overlooking part of the schedule because people didn't even know it was there.

A better example would be the catalytic converter in the intake of WRX's that collapses and then destroys the turbo and/or engine. That shit is bad design.

I'm not trying to put Paul or anyone else offside; but this seems to have really pissed him off. Mate; if you think Nissan did an excellent job; don't change a thing.thumbsup.gif

I don't happen to think they did; and worse than that; I think they did it on purpose.

If cars don't eventually wear out, and eventually cost more to repair than they are worth; why would anyone buy a new one?

Deliberately restricting the service life of components is something manufacturers have done for many years. I believe this is an excellent example.cheers.gif

I'm going to shut up now; as I've taken this thread miles off topic already.

Edited by Daleo
The Stag Wagon Enthusiast

The Stag Wagon

Posted
Posted

loving the feedback on both parties, but if it does absolutely no harm, then why not drill it out to 2mm?

I presume 3 would be pushing it after reading Dale's comments about the larger diameter oil drain

Is it a simple DIY thing that can be done?

ie. whilst servicing it, take out the banjo bolt whilst there is no oil in the engine and get a 2mm drill bit, run it through and give it a bit of a clean up before installing it again?

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